发布时间:2025-01-23 10:37:57
GB825-88 A型B型
区别:
在头部和螺纹连接无螺纹处:
A型:无螺纹部分杆部直径约等于螺纹中径或螺纹大径。
B型:无螺纹部分杆径小于螺纹小径。
飞凡紧固系统
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